Hi Dan,
Yes, now the image has an 'alt' attribute with the section name as the contents: https://github.com/gjb2048/moodle-format_grid/blob/MOODLE_27/renderer.php#L480. It was added back in Version 2.5.3.2 so therefore for M2.5+.
Cheers,
Gareth
Courses and course formats
Alt text for Grid format images
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